Naomi Watts, who dated Ledger from 2002 to 2004, also paid tribute to the late Oscar winner.

"Thinking about this beautiful soul today. 10 years ago he left this world. He was a true original," she captioned a picture of Ledger taken by her brother. "Heart always on his sleeve, with the most powerful charisma, strength, humour and talent. I will never forget his gentle spirit."

This story originally appeared on the New York Post and is republished here with permission.